Deep eutectic-based vortex-assisted/ultrasound-assisted liquid-phase microextractions of chromium species

摘要: In the present work, vortex-assisted liquid-phase microextraction (VA-LPME) and ultrasound-assisted (UA-LPME) techniques were used for speciation of chromium (Cr3+/Cr6+) followed by their determination using flame atomic absorption spectrometry. 1-(2-Pyridylazo)-2-naphthol (PAN) was as a chelating agent to form hydrophobic complex with Cr3+; then, it extracted choline chloride–phenol mixture, an extraction solvent. A solution 1.0 mol L−1 ascorbic acid reducing convert Cr6+ Cr3+ (total chromium), concentration determined from subtraction total chromium. The efficiency two compared in terms type amount solvent, volume pH solution, tetrahydrofuran (THF), time. Based on obtained results, recoveries VA-LPME UA-LPME are 52% 60%, respectively. Therefore, is superior technique than VA-LPME. By optimizing different parameters affecting recovery percentage (RP) Cr3+, calibration curve depicted range 1.5–375.0 ng mL−1 correlation coefficient 0.9937. limit detection 0.4 ng mL−1, relative standard deviation (RSD%) seven replicate analyses 50.0 µg L−1 3.6%. Finally, method successfully applied Cr species food water samples.